75,1

\(\dfrac{453}{76}\)

503556660

6759:90=751/10 

453:76=453/76

65790x7654=503556660

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trl đàng hoàng vào

\(\dfrac{12}{6}+\dfrac{15}{7}=2+\dfrac{15}{7}=\dfrac{14}{7}+\dfrac{15}{7}=\dfrac{29}{7}\\ \dfrac{12}{13}-\dfrac{8}{9}=\dfrac{108}{117}-\dfrac{104}{117}=\dfrac{4}{117}\\ \dfrac{43}{54}+\dfrac{76}{8}=\dfrac{43}{54}+\dfrac{19}{2}=\dfrac{43}{54}+\dfrac{513}{54}=\dfrac{556}{54}=\dfrac{278}{27}\)

\(\dfrac{12}{6}+\dfrac{15}{7}=\dfrac{84}{42}+\dfrac{90}{42}=\dfrac{174}{42}=\dfrac{29}{7}\)

\(\dfrac{12}{13}-\dfrac{8}{9}=\dfrac{108}{117}-\dfrac{104}{117}=\dfrac{4}{117}\)

\(\dfrac{43}{54}+\dfrac{76}{8}=\dfrac{344}{432}+\dfrac{4104}{432}=\dfrac{4448}{432}=\dfrac{278}{27}\)

339 x 45 + 54 x 339 + 339

= 339 x ( 45 + 54 +1 )

=399 x 100 =33900

1234 x 5678 x (630 - 315  x 2)

=1234 x 5678 x 0

=0

339(54+45+1)=339x100=33900

1234x5678x(630-630:1996)=124x5678x0:1966=0

dễ zữ vậy

34 x 54 = 1836 nha

Nhớ k nhé

34x54=1836

HT

9/5

giúp mình đi

2021=21, 1234=13, 1200=12, 234=3, 473=5

=3684

98078 : 89 =1102

5643 : 75 =75,24

7654 : 90 =85,0(4)

98078 : 89 = 1102

5643 : 75 = 75,24

7654 : 90 =85,0(4)